The energy or biomass remaining after heterotrophic respiration is called ..........?

Approximately $.............$ of the Earth's surface is covered by oceans,yet the productivity of the oceans is only $...............$.

State whether the following statements are True or False:
$I.$ The total organic matter synthesized by the producers in the process of photosynthesis per unit time and area is known as gross primary productivity.
$II.$ Net primary productivity is the weight of the organic matter stored by the producers in a unit area/volume per unit time.

Which one of the following ecosystems is more productive in terms of carbon dioxide fixation?

Why is the rate of assimilation of energy at the herbivore level called secondary productivity?

Maximum productivity is found in